Police were called to a flat in Cannon Street, Louth, at around 11pm yesterday (Thursday November 14), where ambulance staff treated a 22 year-old man for an injury to his neck following an assault.
He was taken to hospital in Grimsby, where his condition is not believed to be life-threatening.
Shortly after, officers attended an address in Mercer Row and arrested a 25 year-old man in connection with the incident. He was subsequently taken to Pilgrim hospital in Boston to be treated for an existing head injury. Two women, aged 19 and 20, were also arrested on suspicion of assault and are currently in custody in Skegness, awaiting interview.
A police scene guard remains on the address while the investigation continues.
Anyone with information about the incident should contact DC Nick Jones by dialling 101 and quoting incident number 486 of 14 November 2013.
Report crimes anonymously by contacting Crimestoppers on 0800 555 111.